APID^. 353 



wings nearly clear ; abdomen short and snbrotundate, ita 

 basal segment clothed with long pale hairs, the rest with 

 shorter erect black ones, each with a narrow apical band of 

 adpressed pale hairs, except the fifth in the 9 , which has 

 a dense fringe of dark brown hairs, seventh segment in the 

 S with a central carina, which branches at the apex and 

 forms two teeth, sixth in the ? with a narrow dorsal area 

 densely fringed at its side with dark brown hairs, ventral 

 segments fringed with long pale hairs in both sexes, 

 apical plate of the seventh segment in the form of a trans- 

 verse parallelogram, eighth truncate at the apex, its centre 

 slightly emarginate, armature with the stipites slightly 

 angulated on their lateral margin with a narrow subfiliform 

 apical process ; legs clothed with very pale glittering hairs 

 on their outer side, with darker hairs on the side towards 

 the body, posterior metatarsi as long as the tibiae, which in 

 the ? have a distinct patella. 



L. 9-10 mm. 



Abundant in some localities, appearing in July, and 

 burrowing in the ground, often forming extensive colonies. 

 Chobham ; Woking; Bournemouth; Hayling Island; 

 Coombe Wood; Wey bridge; Black water, Hants; Sid- 

 mouth ; Budleigh Salterton ; Sandown, Isle of Wight ; 

 {Smith), Exmouth ; {Parfitt). Hastings; {Bennett). 

 Bishops Teignton {Marshall) . Saunton Cliffs, N. Devon ; 

 {Swale). 



PSITHYRUS, Lep. 



{Apathus, Newm.) 



The insects that compose this genus associate with the 

 true humble bees, or Bombi, which they closely resemble ; 

 they live in the same nests with them, but it is not 

 known in what way, if in any, they contribute to the 



A a 



